The rainfall regime and its uncertainty in Valencia and Larnaca

Reiser, H.; Kutiel, H.

doi:10.5194/adgeo-12-101-2007

Cited by 9 publications

(6 citation statements)

References 18 publications

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“…This model was tested and used in a series of analyses performed on the rainfall regime in the Mediterranean countries (e.g. Reiser and Kutiel, 2007, 2010a 2010b, 2011, 2012; Anagnostopoulou et al, 2008;Kutiel and Trigo, 2014;Kutiel et al, 2015;Hernández et al, 2016;Wittenberg and Kutiel, 2016).…”

Section: Methodsmentioning

confidence: 99%

Spatial and temporal variability of dryness characteristics in Turkey

Kutiel

Türkeş

2017

Intl Journal of Climatology

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Drought may occur in almost every climatic region on Earth at any time. Understanding the nature and magnitude of the dryness and drought events are crucial mainly in semi‐arid regions characterized by water shortage and warm/hot and dry Mediterranean type climate. The present article analyses the major patterns of the spatial and temporal characteristics of the climatological dryness in Turkey. This study adopts a relatively new approach for characterizing the dryness over a certain region; dry days since last rain (DDSLR). The DDSLR in a certain place can be evaluated using three different metrics; its severity, consistency and temporal uncertainty enabling to present intra‐ and inter‐annual variations of the dryness. The DDSLR is also coupled with the Mediterranean Climate Index (MCI) approach, measuring the seasonality of rainfall. Analyses were based on daily precipitation data recorded at 69 principal climatological and synoptic meteorological stations of the Turkish Meteorological Service network during the period 1970–2011. The spatial distributions of the MCI and the various DDSLR metrics are presented and analysed. Overall, the three metrics of the DDSLR show their highest values in southern parts of Turkey along the Mediterranean and the borders with Syria and Iraq. These dryness indices are even larger than in central Turkey which receives less annual rainfall. On the other hand, dryness is at its minimum along the Black Sea in northern Turkey. Logarithmic equations of the type f(DDSLR) = a × ln(MCI) + b were fitted to describe the dependence of these metrics on the MCI. All regressions are highly significant and enable to evaluate these metrics even in regions without daily data. Finally, linear trends of the longest DDSLR in each year were calculated and reveal trends toward more severe dry conditions in north‐western Turkey and less severe dry conditions in east Turkey.

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Section: Methodsmentioning

confidence: 99%

Spatial and temporal variability of dryness characteristics in Turkey

Kutiel

Türkeş

2017

Intl Journal of Climatology

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“…It was shown the increase in the number of false alarms of the annual precipitation onset. This great variability was reported by Reiser and Kutiel (2007).…”

Section: Fig 3 Illustration Of the Cumulative 20 MM Thresholdsmentioning

confidence: 57%

Identification of rainfall onset for meteorological use regarding to region in the Algerian highlands

Benaichata¹,

Houari²,

Maatoug³

et al. 2019

Journ. Geol., Geogr., and Geoec..

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The data from several weather stations in Western Algeria show a semi-arid climate during last decades. The entire study region showed a great variability in the occurrences of the first and second rainy days in the year. This variability is associated with a positive trend, showing a continuous increasing aridity in the south Mediterranean and the late arrival of the rainy season is well marked. The rainy season in the north of Algeria, spreads from September to June. The origin of the rains differ according to the seasons. The rainfall from June to October is of localized stormy origin, whereas in winter, the rainfall comes from the classical atmospherically perturbations arriving from North or North West. This work objective was to give a definition of the rainy season onset and to show its inter - annual variability according to the Niño and Niña years. The El - Niño phenomenon by its positive and negative phases seems to affect the start of the rainy season. The variability of the rainfall onset indices is very significant. There is a relative stability of the rainy season length over the long term period. A significant delay in the precipitation onset was observed during certain years. A method to define rainy season onset based on daily rainfall data from a weather station in the Algerian highlands was proposed. This approach is based on a climatic point of view, using a frequency analysis of precipitation and dates of their first occurrence. It delays the first heavy rain day (20 mm) when La - Niña settles. If EL-Niño settles, the first heavy rain (20 mm) day will be earlier. These results will improve the probabilistic forecasts of the beginning of the rainy seasons, the cessation as well as the lengths. This work is a preliminary confirmation that the El-Niño phenomenon really affects the Mediterranean climate.

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“…The planning, development and management of water resources are affected by climate change, so today the issue of minimizing the adverse effects of drought has become very important [3]. Reiser and Kutiel [4] have studied the annual rainfall regime in the Valencia and Larnaca stations of the Mediterranean basin. They looked at several parameters, such as: total precipitation, date of accumulated percentage, length of rainy season, number of rainfall spells, rainfall spell yield, ratio between average and median rainfall, the relationship between accumulated precipitation and the number of rainfall spells and the dry spells distribution.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive study of the wet and dry spells and their extremes in the Mediterranean climate basin Northern Tunisia

Mathlouthi¹,

Lebdi

2021

SN Appl. Sci.

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In agriculture, the characterization of dry spells is essential whether it is to calibrate the water needs of crops or the flow rates of rivers. This study seeks to develop a discretization of dry and wet spells on a monthly scale while evaluating the risk of extremes using the renewal wet-dry spell model. This model consists of defining the wet spell according a negligible precipitation threshold. The structure of the model is that all parameters of the climate cycle, including its length, are random variables. To study the trend of the parameters we use the Mann–Kendall test, while the magnitude is evaluated by the Sen’s estimation method. The approach is applied to Ichkeul Lake basin in northern Tunisia to demonstrate its capacity. This region is of great agricultural and water importance, although it holds six large dams. The results show that the duration of the dry and wet spells reach’s, respectively, 49 days and 17 days. The maximum dry spell was 49 days in 1982. The Mann–Kendall test revealed three stations with significant positive trend of the monthly extreme dry spell length (at March) located in south and east of the basin. The trend analysis of the seasonal rainfall number showed one station with significant negative trend in east and one station with significant negative trend in the center of the basin. Results indicated that no significant changes in the start and end of rainy season have occurred over the past years. But a great relation with a subsequent length exists. The results of this research assist farmers and managers in establishing drought management plans. It allow, among other things, to calibrate simulation models for a more realistic management of water reservoirs. It also makes it possible to plan irrigations on a more different basis from that of observations made at regular time intervals. Highlights We analyze the trends of the drought in Ichkeul lake basin, Northern Tunisia, characterized from the daily rainfall data of five stations. The alternating wet-dry spell model and a precipitation threshold value are used to define the rainfall/dry event. The Mann–Kendall test and the Sen’s estimation method were used to analyze the possible trends and the magnitude of variables analyzed, respectively. The results show an increasing trend of maximum monthly dry spells. No significant changes in the start and end of rainy season have occurred over the past years. These analyses provide useful information for science and society and make it possible to minimize unexpected damage due to long dry spells and to have effective and efficient planning for various stakeholders.

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The rainfall regime and its uncertainty in Valencia and Larnaca

Abstract: Abstract. The Most Expected Rainfall Regime -MERR in a certain region is composed of various parameters regarding the annual rainfall regime in that region.

Cited by 9 publications

References 18 publications

Spatial and temporal variability of dryness characteristics in Turkey

Spatial and temporal variability of dryness characteristics in Turkey

Identification of rainfall onset for meteorological use regarding to region in the Algerian highlands

Comprehensive study of the wet and dry spells and their extremes in the Mediterranean climate basin Northern Tunisia

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